### Maths Viva Voce Question 1:Ng Ying Liang

Part B:
From this Viva Voce,I have learnt that the question may be very easy just working out the methods and get the answers and only you need to understand it since you are the one who are doing it. However when it comes to explaining,you need to explain why you do this step,how you derived to this answer. The audience might not understand why must this step be done thus you have to explain the formula. However you might not know the formula as normally you only have to accommodate to one person and that's yourself so you don't need explain. Thus when it comes to explaining to others,you will have trouble trying to state the explanation.
Challenges I have met while doing this Viva Voce is to figure out whether this is mathematically correct when I do this step or even if the working is right. Am I using the correct signs or methods to do the questions. Also having trouble to find out the meaning behind the formula to explain to the people.Regarding recording problem as I want to record all in one go,when I make a mistake I have to re-record again and I record for about 5-6 times even though I have my own script.

#### 1 comment:

1. Part (i): You've described how the equation is derived clearly. You've pointed out the need to 'categorise' the terms (i.e. by moving the terms) and the changing of the sign. However, "why" do you do this, and "how come" the signs change? The 'balancing act' behind the equation has not been mentioned here. When we get -x=-10, it's not just because we know that x is actually positive, it's because the 'solving' is incomplete. By default, when solving equation, what we need to find is "x", and therefore stopping at the step with "-x" is considered incomplete.

Part (ii): "cm^2" should be read as "square centimetre". You have use terms like "substitute" correctly to describe the process. You are also right to say that we can just use one of the length expressions to find the numerical value of length.

Part (iii): The conversion is correct, however, you've missed out informing the viewer that 0.01 comes from the fact that "1 cm = 100 cm".